If a star contains a certain element, it can be determined by studying the star's

A. emission spectrum

B. corona

C. sunspot activity

D. main sequence

Four people weigh a standard mass of 10.00 g on the same balance. The first person obtains a reading of 12.00 g, the second person reads 9.14 g, the third person reads 10.33 g, and the fourth person reads 12.55 g.

The mass of the sun is 1.99*1030kg and its distance to the Earth is 1.50*1011m. What is the gravitational force of the sun on the earth?

When a soda bottle is opened you hear a "whoosh" sound because you are decreasing the pressure of the carbon dioxide in the soda. If the temperature is constant, what else is happening? A. the kinetic energy of the gas increases B.

If you go outside on a hot summer day with a double scoop ice cream cone, how will the cold ice cream interact with the hot outside air?

A copper part is heated. Does its mass, volume and density change?

A book is sitting on a table at rest. Which of the following best describes the forces acting on the book? A.

When NASA's Skylab reentered the Earth's atmosphere on July 11, 1979, it broke into a myriad of pieces. One of the largest fragments was a 1770-kg lead-lined film vault, and it landed with an estimated speed of 120 m/s.?

A spring gains 2.34 joules of elastic potential energy as it is compressed 0.250 meter from its equilibrium position. What is the spring constant of this spring? (1) 9.36 N/m (3) 37.4 N/m (2) 18.7 N/m (4) 74.9 N/m

Form hypothesis: Where do you think we humans get energy?

The distance from home plate to the pitchers mound is 18.5 meters. For a pitcher capable of throwing at 3.85m/s (86mi/hr), how much time elapses between the release of the ball and the ball passing home plate?